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RTC battery
Description Spare part number
For use only on computer models with WWAN compatibility 664994-001
For use only on computer models without WWAN compatibility 599516-001
Before removing the RTC battery, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn
the computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet
and then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 32).
5. Remove the service cover (see
WLAN module on page 37).
Remove the RTC battery:
NOTE: Steps 1 and 2 apply to computer models with WWAN capability. See step 3 for RTC battery
removal information on computer models without WLAN capability.
1. Disconnect the RTC battery cable (1) from the system board.
Component replacement procedures
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